Examples include studies using various cognitive tests for dementia [13], a deep learning framework to identify dementia from DNA datasets [14], gradient boosting (GB) for dementia classification based on human genetics [15], analysis of the dementia-related gene APOE4 [16], ensemble classifiers for multi-class classification using the Alzheimer’s Disease Neuroimaging Initiative (ADNI) dataset [17], and dementia classification based on PET/MRI [18,19,20], with most datasets derived from the ADNI. This evidence concerns the gene APOE and dementia.